Operation Manual – NTPH3C S3600 Series Ethernet Switches-Release 1510 Chapter 1 NTP Configuration1-41.1.3 NTP Implementation ModesAccording to the network structure and the position of the local Ethernet switch in thenetwork, the local Ethernet switch can work in multiple NTP modes to synchronize theclock.I. Client/server modeNetworkClient ServerClock synchronizationrequest packetResponse packetFilters and selectsa clocks andsynchronize thelocal clock to that ofthe preferred serverWorks in server modeautomatically and senda response packetNetworkNetworkNetworkFigure 1-2 Client/sever modeII. Peer modeNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkClock synchronizationrequest packetNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkNetworkActive peerNetworkNetworkWorks in passive peermode automaticallysive peerePasResponse packetSynchronizeIn peer mode, bothsides can besynchronized to eachotherFigure 1-3 Peer modIn the peer mode, the local S3600 Ethernet switch serves as the active peer and sendsclock synchronization request packets first, while the remote server serves as thepassive peer automatically.If both of the peers have reference clocks, the one with a smaller stratum number isadopted.